Singular limit problems of reaction-diffusion systems have been studied in cases where the effects reaction terms are very large compared with those other terms. Such appear literature various fields such as chemistry, ecology, biology, geology and approximation theory. In this paper, we deal singular a general system including many literature. We formulate problem,...

Pressurized oxy-coal combustion has received wide attention recently due to its potential of high efficiency and low cost in CO 2 capture. However, there is still a significant knowledge gap on the effects pressure oxy-char behaviors. In this study, experiments were carried out pressurized fluidized bed combustor, oxygen concentration burnout time, reactivity temperature char particles investig...

We study theoretically the kinetics of the diffusion-limited reaction A+A-+O in the steady state. We consider the effect of an external source which adds correlated pairs of particles. We show that in dimensions below 2 and in the low-density limit spatial self-organization of reactants occurs and is controlled by the correlation in the source term. At higher densities there is a crossover to a...

The interactions of four antitumor azolato-bridged dinuclear platinum(II) complexes, [{cis-Pt(NH(3))(2)}(2)(μ-OH)(μ-azolato)](2+), with calf thymus DNA were monitored dose- and time-dependently, by using circular dichroism. Complexes 1-4 reacted with DNA via a two-step interaction that comprised a prompt diffusion-controlled reaction, which induced a B- to C-form transition, and a relatively sl...

Reduction of N2O by chars from subbituminous Siersza, Piast and Janina coals have been studied in a pressurised reactor at 973 1173 K. It has been found that the reaction N2O + [C] N2 + [CO] is controlled both by the chemical kinetics and diffusion of N2O within char particle's pores. The rate constant of the above reaction has been found to be independent of pressure within the examined range ...

Hydrogen transport through Pd and metal-hydrides has been usually investigated by using potentiostatic current transient technique (chronoamperometry), on the basis of the diffusion-controlled model. This assumes that hydrogen diffusion in the electrode is very slow, while other reactions including interfacial charge transfer and hydrogen transfer are too fast to influence hydrogen transport, a...